Shuttering Engine
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Senior User
Joined: Jul 2001
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Shuttering Engine
I have a 1972 F100 with a 360 and C6. When I accelerate from an idle the engine shutters slightly. It has just recently started doing this and ran fine before. It still idles and runs great down the road. Someone suggested a warped fly wheel, but could it have warped by itself? Is there a way to check if the flywheel is warped?
Any help appreciated.
Thanks,
Bob
Any help appreciated.
Thanks,
Bob
Lead Driver
Joined: Nov 2000
Posts: 6,625
Likes: 342
From: Albuquerque
Shuttering Engine
I think I would start with the simpler things like a good tune up, maybe plug wires, check the condition of the plugs to see if anything is fishy in one cylinder.
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
Thread Starter
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Senior User
Joined: Jul 2001
Posts: 270
Likes: 0
Shuttering Engine
I have put in new plugs and points, but not new wires. I will most likely do that next. I have just recently changed the transmission filter and checked the fluid level a day later to bring it up to full.
It seems to idle very well, wouldn't it be running rough at an idle if it was the plug wires?
Bob
It seems to idle very well, wouldn't it be running rough at an idle if it was the plug wires?
Bob
More Turbo
Joined: Jun 2001
Posts: 571
Likes: 1
Shuttering Engine
might also want to check the accelerator pump on your carb.
with engine off, open the choke flap and look strait down into the carb, then suddenly open the troddle up. you should notice A GOOD HEALTHY shot of gas enter the carb. if little or no gas is shot out then it is probably Time or a carb overhaul.
with engine off, open the choke flap and look strait down into the carb, then suddenly open the troddle up. you should notice A GOOD HEALTHY shot of gas enter the carb. if little or no gas is shot out then it is probably Time or a carb overhaul.
Posting Guru
Joined: Jul 2001
Posts: 1,613
Likes: 2
From: Gainesville, FL
Shuttering Engine
This could be so many things.
1. Check your motor and transmission mounts. As your vehicle speeds up the inertial forces decrease, acceleration decreases, allowing the drivetrain to settle down and realign itself. That's a long shot in the dark. Good Luck.
2.Driveshaft u-joints could cause this but usually give off a good amount of noise to warn you.
3. The two piece driveshafts must be in phase or they can cause a serious shimmy. Just line the Yokes up together. I think C6 applications had one piece driveshafts?
4. How old is this beauty? Does it have a CAT? Clogged CAT can cause problems of all sorts. If it is clogged your exhaust will hiss under hard accel. Probally wouldn't cause a shutter.
Give me some more details.
Kingfisher?
1. Check your motor and transmission mounts. As your vehicle speeds up the inertial forces decrease, acceleration decreases, allowing the drivetrain to settle down and realign itself. That's a long shot in the dark. Good Luck.
2.Driveshaft u-joints could cause this but usually give off a good amount of noise to warn you.
3. The two piece driveshafts must be in phase or they can cause a serious shimmy. Just line the Yokes up together. I think C6 applications had one piece driveshafts?
4. How old is this beauty? Does it have a CAT? Clogged CAT can cause problems of all sorts. If it is clogged your exhaust will hiss under hard accel. Probally wouldn't cause a shutter.
Give me some more details.
Kingfisher?
Thread Starter
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Senior User
Joined: Jul 2001
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Shuttering Engine
Kingfisher,
It's a 1972. One question what is a CAT? It does it in park also, but is not as noticable. I have had it about two years and it started doing it out of the blue one day. It doesn't matter if it is hot or cold.
Bob
1972 F100 360/C6 100K miles
It's a 1972. One question what is a CAT? It does it in park also, but is not as noticable. I have had it about two years and it started doing it out of the blue one day. It doesn't matter if it is hot or cold.
Bob
1972 F100 360/C6 100K miles
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Posting Guru
Joined: Jul 2001
Posts: 1,613
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From: Gainesville, FL
Shuttering Engine
If it does it in park, you can elimanate the entire drivetrain, except for the motor. Are you getting a backfire? If so, it's ignition. If not, its fuel. Check your oil, see if you smell fuel, if so, you've got a bad fuel pump. Replace your fuel filter ASAP. It attaches to the carb. Go from there.
Secondly, the CAT is the Catalytic Converter, a part of the exhaust sytem used to reduce fuel emmissions. Not installed until 1974 and only on specific models.
Good Luck, Have Fun
Kingfisher
Secondly, the CAT is the Catalytic Converter, a part of the exhaust sytem used to reduce fuel emmissions. Not installed until 1974 and only on specific models.
Good Luck, Have Fun
Kingfisher
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Lead Driver
Joined: Nov 2000
Posts: 6,625
Likes: 342
From: Albuquerque
Shuttering Engine
Re plug wires: They generally break down under load. Try this, in a dark garage have a friend put in gear and give it a little gas while holding the brake. If it's good and dark you may see some flashes of light/corona discharge if they are weak.
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything